Answer:
D
Step-by-step explanation:
Using sine rule
a/sin A =b/sin B
8/sin90° = x/sin60°
8 * sin60° = x
x =
0= x
8= 8 + 4x +5x
Combine like terms
8 = 8+9x
Subtract 8 from each side
8-8 =8+9x-8
0 = 9x
Divide by 9
0/9 = 9x/9